For each of the questions regarding genes and proteins that control development in flies and mice, select the appropriate response from the list. Group of answer choices These localization of these proteins is required for initial polarity establishment during early mouse development [ Choose ] This maternal effect gene's mRNA is localized to the posterior end of the Drosophila oocyte and early embryo [ Choose ] This transcription factor is required for the specification of trophectoderm in mice [ Choose ] Is expressed in developing mouse ovaries, but not in testes [ Choose ] Gene that is required for the regression of Mullerian ducts in male mice [ Choose ] Gene that is required for the activation of even-skipped stripe 2 in Drosophila embryos [ Choose ]
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Question 1 This question refers to development in Drosophila. A) Name and describe one maternal-effect gene that provides the initial information for the developing Drosophila embryo. B) What are the four classes of segmentation genes and what roles do they play in development? Briefly describe the roles and give one example of a gene in each of the 4 classes. Provide specific information on what each gene does. C) During what developmental stage of the Drosophila are homeotic genes expressed and what are their main functions? Give one example and discuss what its effect is, and how and why it is conserved in very divergent animals. D) If a fertilized Drosophila egg is punctured at the posterior end and a small amount of cytoplasm is allowed to leak out, what will be the most likely effect on the development of the fly embryo? Be specific as to the phenotypic effect, the gene(s) that would be involved, and the reasoning you used to predict the outcome you describe.
Dominador T.
Sri K.
The developmental control pathway that results in polarity and pattern formation in the head-abdomen axis in Drosophila a. has a similar gene sequence and chromosome order in the mouse. $b$, arose only in insects during evolution. $c .$ determines only the organs that arise in head segments. $d$. involves only gene products made by the embryo. $e .$ arose through new genes that had not existed before in any form.
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